Safety gikctrit maker ajud breaker lock for induction coils



u 1929- A. w. MABBUTT SAFETY CIRCUIT MAKER AND BREAKER LOCK FOR INDUCTION COILS 1924 2 Sheets-Sheet Filed Jan. 2

W Ma bull 5 mp W A a in n 7, 7 1 J W llar I I f m w o w a a m 3 m 5 a m w V'IIIII'IIII IIIIIIIII'III'I June 25, 1929. A. w, MABBUTT SAFETY CIRCUIT MAKER AND BREAKER LOCK FOR INDUCTION 001115 2 Sheets-Sheet 2 an uc-nl'ot t w Ma b buTl Filed Jan. 2, 1924 IIL Patented June 25, 1929.

UNITED STATES ALBERT W. MABBUTT, F MOHRLAND, UTAH.

SAFETY CIRCUIT MAKER AND BREAKER LOOK FOR INDUCTION COILS.

Application filed January 2, 1924. Serial No. 684,039.

This invention relates to improvements in safety circuit maker and breaker devices for controlling the ignition circuits of automotive vehicles.

I The primary object of this invention is the provision of a circuit maker and breaker lock for induction coils which is key controlled for regulating the efficiency of the windings of the coil.

A further and important object of this invention is the provision of a combined induction coil and safety circuit maker and breaker lock which is used for opening or closing the primary winding of the induction coil with respect to the ignition circuit in which the coil may be located.

A further object of this invention is the provision of a safety circuit maker and breaker lock for induction coils embodying means for short circuiting the secondary winding of the induction coil with respect to an ignition circuit in which the coil is used.

A further object of this invention is the provision of a safety circuit maker and breaker lock for induction coils, adapted when it is desired to render the ignition circuit in which the coil is located inoperative, to open the primary winding thereof and short circuit the secondary winding with respect to the ignition circuit.

Other objects and'advantages of this invention will be apparent during the course of the following detailed description.

In the accompanying drawings, forming a part of this specification, and wherein similar reference characters designate corresponding parts throughout the several views,

Figure 1 is a fragmentary cross sectional view taken through an induction coil showing the principle of the improved safety circuit maker and breaker look as embodied with the primary and secondary windings thereof. c

Fig. 2 is a cross sectional view taken through the lock'portion of the induction coil substantially at right angles to the view illustrated in Figure 1.

Fig. 3 is a transverse cross sectional view taken substantially on the line 33 of Figure 1.

Fig. 4: is a front elevation of the improved safety circuit maker and breaker look as 5 embodied in an'induction coil, showing the manner in which the improved device may be mounted upon a dash or instrument board of an automobile vehicle.

Figs. 5 and 6 are rear and front elevations respectively of the induction coil lock casmg.

Fig. 7 isa diagrammatic representation of the induction coil, showing the relation of its primary and secondary windings to the high tension circuit of an automotive vehicle ignition system, and showing the improved safety circuit maker and breaker means as used with said winding.

In the drawings, wherein for the purpose of illustration is shown only the preferred embodiment of this invention the letter A may generally designate the ignition circuit or system, of an automotive vehicle,

which may include a battery B; induction coil C; distributor D; and lock E which includes the improved circuit maker and breaker means for the windings of the induction coil C.

Referring to the induction coil C, the same preferably includes the outer housing 10 of insulation, within which the iron core 12 is axially located, and immediately around which core 12 the primary winding 13 of the induction coil is located. The secondary winding 14 is located between the primary winding 13 and the outer shell of the casing or housing 10, as can well be understood by those skilled in the art to which this invention relates. The forward part 1'7 of the shell or housing 10 is relatively thick, and within which the recess or socket 18 is provided for receiving the lock mechanism E.

The lock mechanism'E, by way of ex- 7 ample, may include a substantially polygonal shaped insulation casing 25, which at its rear end is provided with the annular attaching flange 26 which is adapted for abutment against the bottom wall of the socket or recess 18; this flange 26 having 36 provided with a key way ing 25 in a non-detachable relation, the wires 28 which extend into the socket or recess 18 are spirally wound about and thru the housing or casing 25 in this space, and are embedded in the cementitious material 30 when the same hardens, so that part of the primary winding of the coil 0 extends into the lock construction E, and any unauthorized'removal of the lock' E will result in the destruction of the primary winding of the coil 0 to render the same inoperative. That portion of the primary winding which extends into the lock construction E provides upper and lower spaced contacts 30 and 31 respectively which extend radially inwardly through the lock casing 25 into the bore or chamber 37 -thereof, and provide contact points for engagement with the lock cam 38 as a means of making or breaking a circuit in the primary winding.

The lock mechanism E furthermore includes a tumbler cylinder 35, which is adapted to be fixedly positioned within the lock casing or housing 25, and which rotatably carries eccentrically thereof the barrel 37 longitudinally therethrough. The tumblers 39 of the cylinder and barrel 36 are of the ordinary construction and are operated by means .of a key 40 to be inserted in the slot 37 for purpose of rotating the barrel 36. The barrel 36 rearwardly thereon has a tub extension of insulation material, Which extends into the compartment at the rear end of the casing 25 between the rear surface of the cylinder 35 and the bottom of the recess 18, and which has the cam member or bolt 38 fixedly carried thereby for movement with the barrel 36. The cam member or bolt 38 preferably includes a portion which is directly connected to the insulation extension 45, which has an annular circumference 47 thereon with which the primary 'winding contact 31 is in constant engagement. The lateral extension 49 of the cam 38 is adapted to engage or disengage the contact 30 of the primary winding at its outer edge. An

abutment 50 is provided on the casing or housing 25, which extends into the areaof the housing bore 37 to limit the position of the cam shank 49 when said cam 38 bridges the contacts 30 and 31 for the purpose of closing the circuit through the primary winding 13 of the induction coil. As the cam member 38 is eccentrically mounted within the housing bore 37, a recess 40 is provided in the lock casing 25, within which the shank 49 may operate to open the primary winding circuit. A shoulder 41 is vprovided at the end of this recess 40 against whichthe bolt or cam shank 49 engages when the primary winding circuit is broken,.

' substantially as is illustrated in Figure 3 of the drawings.

From the foregoing description of this inpose of supplying current to the ignition system.

It is also the purpose of this invention to short circuit the secondary winding of the induction coil C, so that any residuary induced current in the secondary winding can not be'used for purpose of supplying ignition to the spark plugs. To this end, contacts 60 and 61 have been placed in the insulation lock casing 25, which are exposed on the shoulder 41 against which the cam or bolt 38 engages when the primary circuit is open, so that this bolt or cam 38 will bridge between said contacts 60 and 61. The contact 60 is grounded, as at 62, in the ignition circuit, and a wire 63 leads from the contact 61 rearwardly along the induction coil, and is spliced in the secondary winding of the induction coil C at the end of the same opposite to the lock mechanism E. It is apparent that the bolt or cam 38 also controls the secondary winding, so that when the bolt 38 is in position to open the primary winding, said bolt will engage the contacts 60 and 61 for purpose of connecting the secondary winding with the ground 62 to short circuit the same with respect to the ignition circuit. The cam or bolt member 38 together with the contacts 60 and 61 thus provide a switch, which has been designated by numeral 7 0 in the diagrammatic view in Figure 7 of the drawings. This switch 70 will always be closed when the primary winding switch 55 is open, and vice versa.

From the foregoing description of this invention it is apparent that a safety circuit maker or breaker lock for induction coils has been provided which possesses considerable merit over present known methods of placing safety switches in the ignition circuit of automotive vehicles. It is the custom to place such a safety switch in the wire between the battery and the high tension coil, and it is comparatively easy for one skilled in the Wiring of ignition circuits to bridge the distance between the battery and the ignition coil, cutting out the ordinary safety switch. However, with the use of the improved lock and safety circuit maker and breaker, as a unit, in cooperative construction with the ignition coil, the circuit in both the primary and secondary windings are controlled, and the lock cannot be removed or tampered with unless total destruction of the primary winding results.

The induction coil C may be supported upon the vehicle dash G by appropriate attaching flanges 75 and securing elements 76, so that the face of the lock E is exposed at the front of the dash or instrument board G.

Various changes in the shape, size, and arrangement of parts may be made to the form of the invention herein shown and described, without departing from the spirit of the same or the scope of the claims.

I claim:

1. In combination with an ignition circuit including an induction coil having primary and secondary windings, and a switch mechanism including a movable arm, said primary winding including a pair of spaced terminals for the switch which the arm may bridge and engage to close' the primary winding or disengage to open the primary winding from the ignition circuit, said secondary winding including terminal means which the arm of said switch may bridge to short circuit the secondary winding from the ignition circuit when the arm is out of bridging relation with the first mentioned spaced terminals.

2. In combination with an ignition system for automotive vehicles including an induction coil having primary and secondary windings, and lock mechanism for controlling the efficiency of said coil including a including primary and secondary windings,

a lock mechanism including a movable bolt, said primary winding having convolutions thereof wound about said lock and providing spaced contacts extending into said lock for cooperation with the bolt of the lock so that the latter may bridge said contacts for closing the primary winding.

4. In a device of the class described the combination with an ignition system for an automobile including an induction coil having primary and secondary windings, a switch including a switch arm normally closed to place the primary winding of the coil in circuit with the ignition system, one end of the secondary winding of the coil being grounded and the other end connected in line circuit with the ignition system, a ground line including spaced terminals connected with the end of the secondary winding having line connection with the ignition circuit, said switch arm of the switch. above mentioned being adapted to bridge said t-erminals and close the said ground line when the switch arm is moved to an open position to open the circuit through the primary coil.

ALBERT W. MABBUTT. 

